File: gap-animation-004.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Box Alignment Test: gap test animation</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://www.w3.org/TR/css-align-3/#column-row-gap">
<link rel="help" href="https://www.w3.org/TR/css-animations-1/#keyframes">
<meta name="assert" content="This test checks that gap property is interpolable for each longhand (row-gap and column-gap) independently.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @keyframes gap-100-200-to-200-400 {
    from { gap: 100px 200px; }
    to { gap: 200px 400px; }
  }

  #target {
    animation-name: gap-100-200-to-200-400;
    animation-timing-function: linear;
    animation-duration: 2s;
    animation-delay: -1s;
    animation-play-state: paused;
  }
</style>
<body>
  <div id="target"></div>
  <div id="log"></div>

  <script>
    test(
      function(){
        var target = document.getElementById("target");
        assert_equals(getComputedStyle(target).gap, "150px 300px");
        assert_equals(getComputedStyle(target).rowGap, "150px");
        assert_equals(getComputedStyle(target).columnGap, "300px");
      }, "gap is interpolable");
  </script>
</body>